[geos-devel] GEOS & DWithin/Beyond

Paul Ramsey pramsey at refractions.net
Tue Jun 12 18:17:55 EDT 2007

Martin Davis wrote:

> As a further note, the reason for having this as a separate predicate 
> rather than simply using distance() is that in theory isWithinDistance 
> can be optimized more easily and aggresively than distance().

In practice as well, Mark Leslie will be committing an ST_DWithin to 
PostGIS shortly that transparently does the Right Thing to index the call.


   Paul Ramsey
   Refractions Research
   pramsey at refractions.net
   Phone: 250-383-3022
   Cell: 250-885-0632

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